Image Courtesy: University of Stuttgart
Researchers have achieved a significant milestone in wireless energy transfer, reaching up to 95 percent efficiency in stationary systems and over 90 percent for moving applications. The development brings cable-free charging closer to matching the performance of traditional wired solutions.
The work, led by Nejila Parspour at the University of Stuttgart, focuses on inductive charging technology that uses alternating magnetic fields to transfer energy between coils without physical connections. The system enables electricity to move across air gaps, removing the need for plugs and cables, according to University of Stuttgart.
Inductive charging operates by passing electric current through a primary coil to generate a magnetic field, which then induces a voltage in a nearby secondary coil. While the concept is well established, achieving high efficiency over larger distances requires advanced electronics and precise control systems.
One of the main advantages of the technology is improved convenience and reliability. By eliminating cables, which are often points of wear and failure, wireless systems can reduce maintenance needs and enhance safety. For electric vehicles, this could allow automatic charging simply by parking over a designated pad.
More advanced implementations extend the concept further. Infrastructure embedded beneath road surfaces could enable vehicles to charge while driving, reducing reliance on large onboard batteries. This approach could lower demand for raw materials such as lithium and improve overall energy efficiency.
The technology also supports bidirectional energy flow. Electric vehicles equipped with wireless charging systems could return power to the grid when needed, functioning as distributed energy storage units. This capability may help stabilize electricity networks and support the integration of renewable energy sources.
Beyond transportation, wireless power transfer is being explored in industrial and medical applications. Autonomous machines can recharge without stopping, while implanted medical devices can operate without external wiring, reducing risks associated with invasive connections.
Although the technical performance has reached practical levels, wider adoption will depend on infrastructure development and regulatory support. Large-scale deployment would require coordination between industry stakeholders and policymakers to establish standards and integrate the systems into existing energy networks.
The breakthrough suggests that wireless charging could become a viable alternative to conventional methods, with implications for how energy is delivered and managed across multiple sectors.
